Discharging device for sludge basins



'Nom 4 14924.

M. PRUSS lDISCHARGING DEVICE FOR SLUDGE BASINSY Filed Oct. 26 1922 Patented Novd, i9244 MAX Pnss, or ESSEN, GERMANY.

DISCGING DEVICE FOR SLUDGE BASIINS.

Application led October 26, 1922. Serial No. 597,213.

To all whom z't may concern Be it known that I, MAX PRSS, a citizen -oi' the (ierman'lepublic, and residing at Essen, Germany, have invented certain new and useful Improvements in a Discharging Device for Sludge Basins, of which the following is a specification.

The present invention relates to improvements in discharging devices for sludge basins, and it has for its object to overcome the drawbacks prevalent in existing devices used in this capacity, by providing an improved arrangement, which is represented, by way of example, on the accompanying drawing, in which:

Fig. l is a cross section through a sewage basin with sludge settled therein,

l? ig. 2 is .a front view of a suction shovel hereinafter described and by means of which -the sludge below .water levelis to be digged off,

Fig. 3 is a longitudinal section through said ladle with a suction orifice and a rinsing pipe hereinafter described, f

F ig. 4 is a cross section 4through a narrow sewage basin with a bridge construction running vover the same and on which said shovel and a plow hereinafter described are adjustable in their positionpf height,

F ig. 5 is a longitudinal section through the middle of the sewage basin shown in Fig. 4.

According to the invention, the sludge is not compelled to flow to the suction orifices or to be driven toward the latter by the water sucked ofl' with the sludge, as is the case with sludge pumps having stationary pipes, but the suction orifice is continuously pressed against the sludge settled in the basin. For this purpose, the suction orifice a (Fig. 1) is longitudinally movable on a bridge construction b with a truck 71, and adjustable on said track in its position of height. With rectangular' basins, the bridge b is made to run to and fro over the basin, while with round basins, it moves circularly over the water level. Thus,.by a movement of the bridge, by a'displacement of the suction orilice along the bridge, and by the adjustment of its position of height on the bridge, e. g. by a movement to 3 coordinates, the suction orifice can be brought 4to any place of the basin to be emptied, The sludge is thus digged off automatically in layers and strips from its posi-tion below waiter level. In order to permit said digging oli' without stirring up the sludge, e. g. without disturbing the clearing work not to'be interrupted, the suction orifice is fitted with a digging shovel c similar to the dredging ladle of a bag scoop (Figs. 2 and 3). Said shovel may also be closed at the top d. The sludge digged off in broad strips is forced into the shovel when advancing the latter and suckedxofi' from the shovel from up above without any danger of water breaking through. In Fig. 1, the suction orifice is attached, by means of a flexible pipe f, to the stationary suction pipe g leading to the pump'.A In some cases, it may be preferable to locate the pump on the truck 7L, which is movable on the bridge Z; for a. displacement of the suction shovel, and to make the pressure pipe flexible.

By an advance of the suction shovel the sludge with the water contents is forced'into the shovel in the condition as it has settled in the sludge,1 basin. Coarse-grained sludge is there frequently so compact that it is not capable of being pumped. Insuch cases, it is necessary to stir up the sludge in front of the suction orifice a or even to add some water thereto in order to make it capable of being pumped. For this purpose, a rinsing pipe e with spraying nozzles Lis provided in the shovel, through which compressed air or water is forced into the sludge in the shovel or mixing water is sucked thereinfrom the water above the sludge by within the shovel. i

In this connection, it. is also possible toL add to the pressure water chemical Vsubstances required for a further treatment of the sludge andthe mixing of which with the sludge on its Way through the pipings and the pump is as intimate as possible. Thus, for instance, lime-milk may be added through the rinsing pipe during the pumping off, to sludge capable of putrefaction, which, though harmless in water, would cause bad smells'in the atmosphere.

By the addition of rinsing water to the sludge, the latter can be delivered of such va consistency as is desired for its further treatment.

in its position-of height, the whole discharging device can be put above water level 1n the suction effect i By the adjustabiiity of the Suction shovel, y

its position of rest (see dotted position Fig. l), and here cleaned and preserved. Nqt one single pipe, no slide, no movable part remains then below water. With large clearing plants suioes the provision of the v discharging device for one basin only, the

whole device being so designed that it can be run, together with the whole suctionl pipes required and the pump house, from one basin to the others and need be attached to the pressure pipe of each basinonly.

The constructional details of the bridges and their moving contrivances may be of any appropriate type. Circularly moving bridges may run lon the circumferential wall of the basin, or on the basin circumference and a central pillar, or as a portable turningscrane on the latter only, which may be connected with the pillarof the adjacent basin by a track for the turning-crane.I rThe movability of the bridge must always be such that the suction ladle can be led to any place of the sludge basin.

The displacement of the suction ladle along the bridge requires a certain expenditure of construction, which can be reduced by arranging, instead of one shovel only, a plurality of same which are adjustable in their position of height on the bridge and which can be lowered successively and put to work. Thereby, the stripwise digging off of the sludge is. attained in the same way. Said shovels may be arranged directly beside each other, though the working extent of each shovel in lateral directions may be increased by 'shitting .the sludge onto the respective shovel by means of a plow z', which is adjustable in its position of height on the bridge (Figs. 4 and A. whirling up of the sludge need not be feared owing to the speed of advance amounting to some millimeters per second only. The plows, can, of course, also be employed in connection with circularly moving bridges.

What l claim, is

' 1. ln a discharging device for sludge basins, the combination of a bridge movable over the basin, and a suction shovel movable 'along and adjustable in its position of height on said bridge, substantially as set forth.

2. In a discharging device for sludge basins, the combination of a bridge movable over the basin, a suction shovel movable `along and adjustable in its position of height on said bridge, and a rinsing pipe with spraying nozzles in said kshovel designed to dilute therethrough the sludge in the shovel by supplying a pressure medium thereto, substantially as setforth.

3. In a discharging device for sludge basins, the combination of a bridge movable over the basin, a suction shovel movable along and adjustable in its position of height on said bridge, and a rinsing pipe with spraying nozzles in said shovel de height on said bridge, and a rinsing pipe with spraying nozzles in said shovel designed to dilute therethrough the sludge in the shovel by supplying a pressure medium thereto and at the same time to miX therethrough the sludge with chemical substances, substantially as set forth.

5. In a discharging device for sludge basins, the combination of a bridge movable over the basin, and a plurality of suction shovels adjustable in their position of height on said bridge and adapted to be successively lowered and put to work, substantially as set forth.

6. ln a `discharging device for sludge basins, the combination of a bridge movable over the basin, a suction shovel movable along and adjustable in its position of height on said bridge, and a plow adjustable in its position of height on said bridge and designed to increase the working extent of said shovel in lateral directions, substantially as set forth.

ln testimony whereof l have hereunto.

set my hand in the presence of two subscribing witnesses. A

, MAX rRss. Witnesses:

L. F. K. STEPHAN, ANNIE STEPHAN. 

